The ground rules were given, and PSK was with you. If you have a PLB in your PSK, then why not use it?
If I was truly lost, had been walking for miles in the forest, nobody knew I was there, and temps were dropping to 40? Of course I would probably try to hunker in first, but there are a LOT of factors that make me think a PLB might be the way to go. Why have it if not for use in an emergency.
Of course, it's HIGHLY unlikely any such situation would arise with a person carrying that equipment in the first place. Not impossible, but it seems to me someone with the knowledge to purchase a PLB either has way too much cash on hand or would be prepared to go on that little trek in the first place.
My call would be "Do I think I can get myself out of this?" If I do, then I would hunker down for the morning sun. If not, I guess I'm paying for a rescue effort. <img src="/images/graemlins/smile.gif" alt="" />
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Experience is a hard teacher because she gives the test first, the lesson afterwards.